Cover of original binding by Henry M. Isaacs reads "Boundaries and patents: Rancho Los Cerritos, Rancho San Pedro, San Gabriel River, correction of call in Patent at mouth of San Gabriel River, Mexican and Spanish grants, Headland to headland doctrine."

Correspondence, most to or from Henry M. Isaacs, including: "Pre emptions, tide lands and surveys," C.C. Grove, 8 page typescript on the history of surveys of tidelands around San Pedro Bay area, claiming early surveys were erroneous (1891)

"Interpretation of patent description of the boundaries of Rancho Los Cerritos and Rancho San Pedro," S.M. Marshall (PD&TC), typescript, 38 pp (1939)

Two maps showing property boundaries interpreted under different legal doctrines (undated)

Correspondence re property rights in areas affected by erosion and accretion (1939)